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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Plasmonic Resonances in Ag-Au Nanosphere Heterodimers: How Accurate Are the Approximate Analytical Descriptions?
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Plasmonic Resonances in Ag-Au Nanosphere Heterodimers: How Accurate Are the Approximate Analytical Descriptions?

机译：Ag-Au纳米球异二聚体中的等离子体共振：近似分析描述的准确性如何？

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摘要

Modeling and computation of the optical response of noble metal nanoparticles and their assemblies have played a pivotal role in plasmonics research. The methodologies adopted range from analytical approaches such as the Mie theory and the quasi-static approximation to the computationally intensive approaches such as the finite element method, T-matrix method, finite-difference time-domain (FDTD) method, and the boundary element method. Metal nanosphere homodimers have been employed by researchers as prototype systems for discerning the fundamental aspects of plasmon coupling, leading to the emergence of applications such as plasmon rulers and surface-enhanced spectroscopy. In contrast, nanosphere heterodimers have received much less attention. Herein, we employ analytical approaches based on the electrostatic and the electrodynamic polarizabilities as well as the Mie theory to describe the optical resonances in Ag-Au nanosphere heterodimers within the framework of the coupled dipole approximation. The computationally intensive FDTD method is further used as a benchmark to assess the performance of the analytical methodologies. The incorporation of the radiative damping and retardation effects by way of electrodynamic dimer polarizabilities results in very good agreement of the spectral peak positions as well as the intensity patterns with those obtained from the FDTD simulations. The computational costs associated with the analytical approaches are much lower than those of the FDTD method, and therefore such approaches are immensely valuable in plasmonics research.
机译：贵金属纳米颗粒和它们的组件的光学响应的​​建模和计算都起到了关键作用在等离子体研究。这些方法采用范围从分析方法，如Mie理论和准静态近似，计算密集的有限元法的方法，例如，T-矩阵法，有限差分时域（FDTD）法，和边界元方法。挑剔的等离子体耦合的基本方面，从而导致应用，如等离子体统治者和表面增强光谱出现金属纳米球的同型二聚体已受雇于研究人员的原型系统。相比之下，纳米球异已收到注意要少得多。在此，我们使用基于静电和电动极化以及Mie理论来描述耦合偶极近似的框架内银金纳米球异二聚体的光共振的分析方法。计算密集FDTD方法进一步用作基准以评估分析方法的性能。的通过的电动二聚体极化的结果的方式的辐射阻尼和延迟作用在光谱峰位置的非常好的一致性，以及与从所述模拟FDTD获得的那些的强度图案的掺入。与分析方法相关的计算成本比域有限差分法的低得多，因此这种方法是非常有价值的等离子体研究。

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